Replaces usage of ConfigFileApplicationListener with a subclass.

BootstrapConfigFileApplicationListener.java overrides the onApplicationEvent() method to not throw an exception.

spring-cloud-context/src/main/java/org/springframework/cloud/bootstrap/BootstrapConfigFileApplicationListener.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2013-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.bootstrap;
+
+import org.springframework.boot.context.config.ConfigFileApplicationListener;
+import org.springframework.context.ApplicationEvent;
+
+/**
+ * Overrides ConfigFileApplicationListener to disable exception.
+ *
+ * @author Spencer Gibb
+ * @since 3.0.0
+ */
+@SuppressWarnings("deprecation")
+public class BootstrapConfigFileApplicationListener
+		extends ConfigFileApplicationListener {
+
+	@Override
+	public void onApplicationEvent(ApplicationEvent event) {
+		// do nothing, overrides exception thrown.
+	}
+
+}

spring-cloud-context/src/main/java/org/springframework/cloud/context/refresh/LegacyContextRefresher.java

@@ -21,8 +21,8 @@ import java.util.Arrays;
 import org.springframework.boot.Banner;
 import org.springframework.boot.WebApplicationType;
 import org.springframework.boot.builder.SpringApplicationBuilder;
-import org.springframework.boot.context.config.ConfigFileApplicationListener;
 import org.springframework.cloud.bootstrap.BootstrapApplicationListener;
+import org.springframework.cloud.bootstrap.BootstrapConfigFileApplicationListener;
 import org.springframework.cloud.context.scope.refresh.RefreshScope;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.core.env.MutablePropertySources;
@@ -60,7 +60,7 @@ public class LegacyContextRefresher extends ContextRefresher {
 			// listener because it has side effects)
 			builder.application()
 					.setListeners(Arrays.asList(new BootstrapApplicationListener(),
-							new ConfigFileApplicationListener()));
+							new BootstrapConfigFileApplicationListener()));
 			capture = builder.run();
 			if (environment.getPropertySources().contains(REFRESH_ARGS_PROPERTY_SOURCE)) {
 				environment.getPropertySources().remove(REFRESH_ARGS_PROPERTY_SOURCE);